Based on the justification they gave for the SON prices last year it was £400k to put the event on at Belle Vue. I'm sure there's some savings reducing to 2 nights but it's still not going to be cheap.
Sadly, my price predictions were pretty much spot on when they announced this but I still think they'll sell out. Unfortunately, they're going to annoy a lot of supporters in the process.
You were shifting in the region of 30,000 tickets for Cardiff so the thinking will now be that at least a quarter of them would pay "premium" prices.
16000(ish) over 2 nights at an average of £90 a ticket is just over £1.4m.
I wonder who is underwriting this if they have got it wrong?